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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01db0333958af58bcb61dddaa32ec7327857848b067630aafc45b4f081e6e539' 
  AND token = 'FrT5ynWXTs6RLf70aRvskjh8lwdbOuFPW7JROsscxf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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