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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c025c006ba0869389a6de5f253a31ca4af5c74bb61b59006b658854d83b8f906' 
  AND token = 'o6PZRIid0ctc/eSCuWj5PUQpRdJ5cvn0nXPaTN6o3k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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