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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c010ec0b9e354cf890bd7f67b3cf1a58920f881af6e553581297f660c1700e27' 
  AND token = '76jG3oCCkVdATu9rd9pDdDG3EuBqySQ0cUxJJMNARRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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