SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5abd8c8502f429009661315ed46ab4d2ec3677f107ca1b327189b34d89582b1' 
  AND token = 'Ga/DhLvSrWrdGyLhuqcld4vKN76BTbBG0/RPK43jRGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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