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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa4e228dd96df9c0ca60266cb191b760a7ab886a08a1ca59aa7add9ffd8aabe' 
  AND token = 'iECxPSU2HEohrihDC2bcbnBqsa99FSSdPfJ9xJeU0zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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