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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed9a9e35481f66e77909d5a065fc1a4e950563007c2a27bfb56a391748399b3e' 
  AND token = 'eSbo8iGuuYPacuzm7rBYKhMeatM6Fn3cWRZOd6BrhrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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