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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8738610e5be860593c117c0cb9b2d1884347e1f9c529989291dadf91e7ae0aa' 
  AND token = 'iUFeW30DWlqDk3rSfrHty0DuuMk6O8EKtd85fImhDYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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