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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff0b9d362ed1003471743ecdec071baa16f1a2cd9f07816db4e5d4bd3bc16926' 
  AND token = 'SgkAm0WZyW+Rs3MLM3514++vZUAnpFZJ8WvWDVjMhM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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