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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30dfc275f879faa015c55576f36dbfdc64470ac1f0c0d1f4197415d2f54a4cda' 
  AND token = 'kgo3sawea4bo2BFiTd6Bu/HFt31UaUJ/Z6HHgQ0FZaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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