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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca2baf4618e38af3ce8c4e02eadf3ea84a90ddd52207fd8b6fdebc73181ccad6' 
  AND token = '+mOM0LEi3hr91PDkIkVzCGlAX0KP0DXh+4TMn2kFPBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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