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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385f2088e558d8b6b5715fd54683213f99ca768e896fce5562ab4106748e2eb4' 
  AND token = 'gWL7ba7reIyG88Czb3jI7P/WO9ROKitaX+Y3/gaEiNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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