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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb12c7e1f01cb23e0436538132f53e91cf92c939aefcf50da867da0c694f139' 
  AND token = 'ZPFow6l3pPb33mRnMwGj360I4Ic90dSwydwhusnfJH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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