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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cdbab9adba5ff35ba73477c2ef0d7e1816cf130c538705e25a65388cbe5e69d' 
  AND token = 'nHj5IT5HFwqc9JgL6p6jz1mJZGifltlAzzwSMb3UDSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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