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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '002462ce8eda6f6b0680f9343cfd1686fbb55ed4312b07b61e18557f975e6b1d' 
  AND token = 'J3kT0U26IqtaQ5nSflsu+SoP3lmphlA0CDThn5eNJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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