SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50a3cc03e9177abe0be8da3f41bd1ec2861170432c36f32d2521c88b00f72a4' 
  AND token = 'crHu0B6VlIZAVAG+BJNjc7Wyt8Hg1wfGWKw9RBcB+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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