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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8b578aa7c0eb83c1d7ba3553435f4ee9c4d8c0d41a6fbf6e2b506d963c5b3ed' 
  AND token = 'khX05uMwdF68GViGeNJkj3vI5H4o7rz8ye6LsConNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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