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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c672c194ab294874ac41487989116ea716816c497d66f3077e837f5df46363e' 
  AND token = 'B80bJbBWKeyymCz2lToUk5ibiQ6H0I8YFMLTbM5KGmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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