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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa8420b01942590d2d9af6826d2ac6b98aa8fdceebae5bb2dba4b5a49787947' 
  AND token = 'wTnwNsvEsHXkJi2wg4mqrQryjJcGek+245c68vWCD94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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