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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ecb2d446f4680de8dfd01261bb9ba4cbc28738a771c110d4832a3c75f65127' 
  AND token = 'Af6InKfs/RO0LgLsjsMPNZszbfp4G8gpDAPCyg9g+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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