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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '811cfabe0414955c9c692453cb722aabd7b49c3faa45251c8a4c3b0b5c4ee6b1' 
  AND token = 'YsaEQo48qHEfeor4Rb2JH5RrF1fOI7XFBlRi5I7zaEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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