SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd333832afc35fc974cab8a1235bf61532611bd7b1f1abfdcdeac922007fdb39e' 
  AND token = 'ph13IRlGdLpC4ZSDuBkgovzHJU3iGAyeBVVtLe5p/mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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