SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c896d6a0aa241eb3d1ce6fb4efc71273f89ba67eafb67052ea5cc4ad9708014' 
  AND token = 'yKyidCPlv6P9ImaDfr1ZXuJfsZnoNYH24ABhajka/wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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