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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41c314e2e2c6f57bcbe2e03f616953105d7cf983bc015796ef15455696275812' 
  AND token = 'DRT5hKZ/1nKCf1ZdD65VdF7ZGYE+3apMlgmUT7iCSdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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