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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bf134e1a50909092ad215e5e6faf38f85db1403150e26ecb43954c22c3c1e86' 
  AND token = 'boixX6ZzO8gAAR7J84yWu+Iq9xqyiUmuAJUbDmKedGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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