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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b5516bb16c79b45cedcee33ac8edddfe4597d594aa9a7732b28072e5b02f77' 
  AND token = '3o5j1Ewfnhdb76lTktRxc3snlmSsj3GTMkd7hmQhzh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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