SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f26fb1189115537769a599272d8ef9de95c68a6b63fc67a04056c3a8be5f070' 
  AND token = 'UR/s4oFPqG5NFztZggbQlxlDqgEqjjltadsbm9nDoDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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