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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b661522477a586152502c45505d288580852fab58d0512120090e9db2138de6' 
  AND token = 'c27eoWWO/scMUfJWzj6+egO50u4hbxS32tXwlrfztLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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