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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3c77f4baa613ec752b6ef16ff5b9d5db8597c255ddd36bbaac6f37644abb149' 
  AND token = 'Qv36+dF2SII/VAebAR76fb6aNSPn4idOieoPhf42KWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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