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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98276234b304aeda1162a0fc6c6fb80561ce71b9df0cb1b4ee5e3faba81e81da' 
  AND token = 'Gd3Hccl6BkDz+jei55LQH2q6Gu9J8ZaG/Qk55jk2dCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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