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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6294783f9c3c7b2ddce636910fb59533c0c815a3462f9f5eef0e3837afa39a5' 
  AND token = '57OrjGODgYuanc1AWfCk/FSYC0CPcIPzhXbNeFBobsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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