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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66df2cf6adfeb912401a0a18bff9b02f52a3d7df599e1794ec409b90cbcc7663' 
  AND token = 'Rcbk91UMuFJ9fJXoZyvwKOZ0kuHzcZ7O3Hx9hHlevlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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