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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d271353e4626994f9e3a5f685d1c60813626c31234328b1faaabbb1cbf7d8a7' 
  AND token = 'Ak1V5KINNqhTI3Ut+FySeg2pPF5k3R0lBAUCmROH8U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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