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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '169f8fbfde7e5c461f8f03ece433424bafc2b5325b2eb37980d2c6b5ccd772bc' 
  AND token = 'jhKJ/OrnMSzSFeCreLovs1aOsx3RrbtK2svG8Zd2XQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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