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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76da3c3d649f11fb68f50f30c2888f93a18570c00ba646ca506c948c337e490b' 
  AND token = 'Rpi3QSxJZ31tGP2nNMk5IosmLiBicwRuXlswuYws0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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