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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '953371aea2beb144f9370a48a1ce224d7d972649544f1986f36977823f6325cc' 
  AND token = 'lPdpoXtsQ9BJ6g+l5d1iuU1WTiwkGafpE7sPb7bTp2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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