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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e710d720418c3ebc8bf516e57c862244b60c1d28ff72957bd1850721774ec7' 
  AND token = '+joyusSrbW4sqysggs6aEegytQ5Pp7ISwCmnhZy5Uwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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