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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f43e9b20f86a6458bd6b90b6db2c4681853c064a92ab46c1c7ebdd4604882e3' 
  AND token = 'OZMp11XQWf9+ahTghbTQZOQL3Bwxnyh40lpw0fOxdEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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