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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65526113f0c00e5a413f615bf305ce3061c67861f8d755da3ea0a253b07da5b5' 
  AND token = 'CX0kUKRjG4Ak0Ezt1ASOb00oxTGm0UdvJLjWHqXAGwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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