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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '393adb58e91f2dd61c150bffe4692891edc2b68ee6114f64058aebe2daa675b6' 
  AND token = '97gQCb9EikmL5EV6eYTvjjmrWmBz6vUKKBlyVigb6Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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