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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e43e21ecfc51340ddd3c56dafd9f533f7324902e6ab99cbe1a7f2e363a7ace3' 
  AND token = 'ISBI0rArQLwqqZKjgmxodJMLf+2eD5bU5vtoKeR18ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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