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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6031318c4e7fb24124c245ea7e1a72ba2e4250fc380da5d5998caabc65e8868e' 
  AND token = 'O2NGyM0GpQO0H2pz+ujOPN9daHXa9Dbey8sk3pyPTjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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