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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a18b5db0569505018975af4db8aba9d7b03360a1502bb22ae30ccd0c34f626d' 
  AND token = 'GBDhHueLZWOGS8zwTEk36SEx0dD3zu2FRLFkHXyvydw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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