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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac3bb4affab435dbba4f3056799326917dc19467bf91a520e026add01e3e9a31' 
  AND token = 'hOOAxEu8jPEHep+4f837UIQv8kvJ/8ZaHmDpSCmHTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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