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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c772cc2eb3e286da10bbc6e257d4d753bf5aa69c972558a9b8b33b58edacad7b' 
  AND token = 'm5h+IzebdCKknSRBMI+R6vRbCD7XaDusKzEno2dpEJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}