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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '011a65a452904d8323b107acbd51b667d1d7311cce82633140124f12ee24f429' 
  AND token = '0n7lcC47Lh3tSQ+F5kQ5jSPVqfWC77MXWFR6kEN6gNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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