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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33a704029c5f1193f9904dd601db46520a63c2e2318bbd6e6a7f9986f1bad508' 
  AND token = '8RwfbYS1WaAfVaaSUL0+UyAokZl0S0cpkofMQDiRAzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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