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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd60888d23276c883a8c6e60aba85d7ecbd6236933cfe1a10041b68a744c8fbee' 
  AND token = 'MVJgyQ0ALsJ1kSW0aRn3Xwc0QnqyYEnKQYOJU3LiZV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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