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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13b7e0a9d39d3b016f197bde9e89350938788fe760f4110926e028cd6dae8d53' 
  AND token = '4QiYfRbZeWs3RtwpxCYYLFdMowkB3/mVoZXpidiYNsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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