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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87996ef3f0f1b67222369e0a4a2cca6ac702ceb839b0c4552c6127443a5f7464' 
  AND token = 'CyRAbbtzdlD69svUwigGT4eZxpLOwLmOwa60Gz/Y07k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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