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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bba3e88fd982459a8ed187050903028c574b94f14c07c7ea56e84fb49a66b88' 
  AND token = 'Qy2lNbl9CH5n0X/W+ewh/QjivvM360/cWUed77AQHRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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