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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23b6ec6268d283a05310d9ba23fb214450e55962e89d86a2e63d978e92980b01' 
  AND token = 'QVJzdNi7rHlw1kgb/SO37NBFJbDnCk9NGsl5ePzdUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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