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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7467792bccd8041fcec1b1f95a08341d66d59f701082570d7a7bae2c51a4eb3d' 
  AND token = 'ycw/kByRj56UAo/m9pP+eRQewT4IIucea6j3fRT6N7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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