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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de04dd6351dfa0a0be1807887630238e1e91ad10400abc48986c9aa05bc918aa' 
  AND token = '8vlmeKWZmS9XF5XM/DGSYPnRpMazAmCv5FBhP/oTnTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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