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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd35dd6968ce2d65a3a31b0f8408ee3db078fc0833ee2efb6863e87e36d9e2959' 
  AND token = 'cqnnnktdeBGesvZaQrx3CVL9A40HgBRCzsRxXflipws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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