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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aa9f91c81ee38c21ed11b338858c19ab67534dcb9000113d8b6fd1460301189' 
  AND token = 'llEOcipq0C1UBpOw5Vw7ywifO7BUDtTS2hKbhonTFu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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