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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '218f83978afee3929fd419e3980e21e7899b3883327a5cd2bdc0e9022b40bc70' 
  AND token = 'ooMddYq7ZQ59GVMJphlzI1CGaGB7WmS4VecDHQPPy3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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