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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf6dfa5abc6ffdf422267a57f61e92bef72b2c6c5a4f0f14a57427943a8a1cf6' 
  AND token = 'wcUYXDj1rlkh0Pmp7Xc+NEXXeSdeiEV8bzshT/CwbnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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