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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f06cfd3f2e8b51096ddc871b69a0d29b916d9bc7924789ba18b1fd07d52c5ee7' 
  AND token = 'BpIAImwEQ/mGfzxnEbF31/9j14fnINs6eN5J6tmyH3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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